Electric switch



Patented v MayA 17, '1927.

UNITED STATES wiLLLaM ILE, o1l

- or .I Acxson,

1,828,884 PATENT oFFlcE.

'ELECTRIC SWITCH.

Application `and uw 28, 1825. )serial No. 33,047.

The invention relates to a noiseless electric switch.

The object of the present invention is to provide a noiseless electric switch of simple,

strong and durable construction adapted to Abe cheaply manufactured and capable of eftecting a quick make Aand break.

With these and other objects in view, the invention -consists in the construction and novel combination and arrangement ofv parts hereinafter fully described, illustrated in the accompan ing drawings and pointedout in the claim hereto appended, it being lunderstood that various changes in the form,

.resorted tov without proportion and minor details of construction, within the scope of the claim, may be departing from the spirit or sacrificing any of the advantages of the invention. e 4In the drawings:

Figure 1 is a longitudinal sectional view of a noiseless switch constructed in accord- 'Y ance with this invention.

contact shell of the tially on the line i for convenience ofillustration.

illustrated the pre detailv view of the stationary -Fig. 8- is a central transverse sectional view of the noiseless switch.

9 isa simllar view taken substan- 9-9 of Fig. 3.

In the accompan ing drawing in which is fserred embodiment of the invention the noiseless switch is shown applied' to a lamp socket, the outer shell or casing Vand the usual lining being omltted Fig.

' lating base is composed of upper and lower sections 1 and 2 provlded with registering semi-cylindrical recesses formmg aline( cylindrical openings 3 and 4 and a reduced connecting cylindrical opening 5 for the reception' of a threadedsleeve 6 and a key 7 having a stem or shaft 8 upon whlch the sleeve is mounted. The sleeve which is constructed of brass or other lconducting mate-v rial is provided with a spiral groove 9 which 1s engaged by a stud 10 molded in the upper sectlon of the insulatingbase and adapted to limit the longitudinal movement of the 'Y sleeve which is caused to'move longitudinally of the openino" 3 by a rotaryy movement of the key.

JACKSON, MICHIGAN, ASSIGNOB. TO REYNOLDSl .SPRING COMPANY,

MICHIGAN, A CORPORATION OF DELAWARE.

lihe insulating base is l designed to be constructed of bakelite. or

other suitable material. Jj f The stem or shaft 8 is journalled in the .reduced connecting portion 5 of the continu-` ous bearing f ormed by th'ealined openings 3 and 4 and the said reduced connectingportion 8 and the stem or shaft is equipped at its outer end with the said key 7 which is molded of bakelite or other suitable material and which consists of a cylindrical portion fitting the outer opening -or portion 4 of the continuous bearing and. rovided at its outer end with a head 11 havlng a checkered or otherwise roughened perlphery to enable it to be readily grasped fr rotating the movable member formed by the stem or shaft the sleeve and the key to carry such movable memberv into 'and out of engage-` ment with av stationary switch contact 12.

switch contact 12 consists of The stationary a strip of metal bent toform an attaching plateor portion 13 and a contact portion which is bent transversely as clearly shown in Fig. 5 and which has its outer portion 'extending into the path or'` the Vmovable member of the switchas clearly shown in Fig. 2 of thev drawing. The terminal p0rtion of the stationary switcltcontact is arranged Substantially at rightl angles to the attaching portion 13 which is secured to the upper section 1 'of the insulating base in an opening .14 formed by corresponding re` cesses in the lower face of the upper section 1 and the upper 'face of the lower section 2 of the insulating base. The stationary Vswitch contact is secured to the upper section 1 of the insulating base by a bolt or screw 15 extending through an opening 16 in the upper section 1 and having a head at its upper end and threaded at'itsl lower end to engage a threaded opening in an apl proximately L-shaped terminal 17 arranged in the opening 14 and carrying a binding screw 18 for the attachment of an end of a circuit wire. The` upper end-of the bolt opening 16 is counterbored or enlarged to arrange theihead of the bolt below the upper contact portion 20, a lower contact portion '21 and an intermediate attaching portion 22'. The lower se'ction 2 of the insulating f base is provided in its lower face with a recess 23 for the reception of the center contact and the attaching portion 22 thereof is riveted or otherwise secured at 24 to a transverse supportingplate 25 bridging the recess 23 at the inner portion thereof and secured by spaced vertical screws 26 to the insulating base.l The screws 26 which also A serve to secure the upper and lower section 1 and 2 of the insulating base together pass through registering 'vertical openings 27 thereof and have lower threaded ends 28 which engage threaded perforations in the end portions of the supporting plate`25.

The upper ends of the bolt openings 27 of the upper section are enlarged to receive thev heads of the bolts or screws 26 and the recess 23 which extends from one side of the lower section of the insulating base to within a short distance of the opposite side is provided adjacent to its inner end with lateral extensions or branches 29 which receivel the end portions of the` supporting plate 25 as clear-ly illustrated in Fig. 9 of the drawing. The upper contact portion of the center contact is angularly' bent atits free end 30 into an approximately lf.-shape, vthe L-shaped end 30 extending through .an opening 31 which connects the recess 23 with the bearing opening of the insulating base.y The resiliency of the metal of the center contact maintains the L-shaped end portion 30 in with the contact sleeve of the stem or shaft 8. The lower contact portion ofsthe center contact is connected with the intermediate attaching portion by a relatively large U- shaped bend 31 which extends the lower contact portion below and into a screw shell contact 32 secured to the lower face of the lower section 2 of th'e insulating base by screws 33 and 34 which piercethe flange 35 of the shell. contact and also an insulating disk 36 as clearly shown in Fig. 8 of the drawing. Thescrew or bolt 33 extends up- 'tachment'of the end of a circuit wire.

wardly from. the lower face of the insulat-4 ing base to an opening 37 formed by registering recesses in the lower face of the upperV section 1 and in the upper face of the lower section'2 and located ata diametrically opposite point from the opening 14. The upper end of the screw 33 engages a threaded perforation in an L-shaped terminal 38 provided witha binding screw 39 for theTsil'.-

- e L-shaped terminals 17 and -38 have a corner or portion bent outwardly to cooperate with firm contact the head of the screw confining the terminal of a circuit wire in the usual manner. The other screw 34 is rovided at its upper end with a nut 40 which is arranged in a recess 41 in the lower section 2 of the insulating` base at the bottom of the opening 14 to space the bolt from theJ terminals 17, suicient air space being provided to insulate the parts.

The lower section 2 of the insulating base is provided at opposite sides of the recess 23 with depending flanges 42 located at opposite sides ofthe bend 31 of the center contact and forming abutments for the insulating disk 36 and the fiange 35 of the shell contact. The flange 35 of the shell contact is provided with an opening 43 of,` sufficient size to clear the center contact and also to prostrain in screwing a lamp into and out ofthe shell contact. By this construction the parts are firmly maintained in proper posi-y tion and loosens and accidental short circuiting are eifectually prevented. It will be clear from reference to Fig. 1 of the drawing that the movable member of the switch `has but little distance to travel to en age and disengage the stationary contact o the switch and that the switch is perfectly noiseless in its operation. lAlso it will be clear that ample air space -is provided at the contacted parts which not only reduces the amount of the bakelite but also insures proper insulation ofthe parts.

What is claimed is: c

A noiseless switch including an insulating base composed of upper and lower sections provided in their opposing faces with reg-l istering recesses, a rotary switch member mounted between the upper and lower sections and having a spirally grooved contact portion, a stud embedded in one of the sections and engaging the spirally grooved con-- tact portion of the switch member Aand causing a longitudinal movement of the same when the switch member is rotated, a stationary switch contact mounted in one of the` said recesses and having a contact portion extending into the path of the movable switchl member and arranged to beengaged by the inner end thereof, and a center contact secured to the insulating base and 'having a; portion bearing against the spirally llO grooved contact portion ofthe rotary 'switch member.

In testimony whereof 1 have hereunto set" myhand.

WILLIAM ILE. 

